try a custom size plate, with legal size numbers.
Or why not adhesive numbers right on the bumper ? Some of us here in France try to cheat with plate size, colour and character style...sometimes it works, sometimes it s worth a ticket. You never know, so just try !
Keep in mind that you 're lucky to have aesthetic plates: did you ever see those ugly european plates ?<img src=icon_smile_dissapprove.gif border=0 align=middle>
Raph , France